Time reversal may refer to:
- In physics, T-symmetry - the study of thermodynamics and the symmetry of certain physical laws where the concept of time is reversed — i.e. where a mirror (reverse) transformation is applied to a forward direction time state.
- Time Reversal Signal Processing, a signal processing technique popular in acoustics, and currently being applied to electromagnetics, that results from the reversal in time of a system's response signal
- Time travel, theorised and speculative concepts about travelling physically through time
Famous quotes containing the words time and/or reversal:
“By the time a person has achieved years adequate for choosing a direction, the die is cast and the moment has long since passed which determined the future.”
—Zelda Fitzgerald (1900–1948)
“Perversity depends on reversal and substitution.”
—Mason Cooley (b. 1927)
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